/Engine/Plugins/Protocols/MQTT/Source/MQTTCore/Public/MQTTProtocol.h
enum FMQTT5Property { PayloadFormatIndicator = 1, MessageExpiryInterval = 2, ContentType = 3, ResponseTopic = 8, CorrelationData = 9, SubscriptionIdentifier = 11, SessionExpiryInterval = 17, AssignedClientIdentifier = 18, ServerKeepAlive = 19, AuthenticationMethod = 21, AuthenticationData = 22, RequestProblemInformation = 23, WillDelayInterval = 24, RequestResponseInformation = 25, ResponseInformation = 26, ServerReference = 28, ReasonString = 31, ReceiveMaximum = 33, TopicAliasMaximum = 34, TopicAlias = 35, MaximumQoS = 36, RetainAvailable = 37, UserProperty = 38, MaximumPacketSize = 39, WildcardSubscriptionAvailable = 40, SubscriptionIdAvailable = 41, SharedSubscriptionAvailable = 42, }